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Audit chown(1)

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Similar to the chgrp(1)-audit:
1) Refactor manpage so it's actually fun to read
2) BUGFIX: Call (l)chown properly when the H-flag is specified
   (only when depth > 0)
3) BUGFIX: Call (l)chown properly when the h-flag is specified
   (only when depth = 0).
4) BUGFIX: Only recurse() in chgrp() when the initial chownf()
   succeeds.
5) Style fixes, argv-basing.
6) Rename status to ret for consistency.
7) Add blank line before return.
This commit is contained in:
FRIGN 2015-03-09 00:37:34 +01:00
parent 8f436abde6
commit 3a04302c66
3 changed files with 52 additions and 43 deletions
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2
README
View File

@ -14,7 +14,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
=*| cat yes none
=*| chgrp yes none
=*| chmod yes none
=* chown yes none
=*| chown yes none
=*| chroot non-posix none
=* cksum yes none
=* cmp yes none

33
chown.1
View File

@ -1,4 +1,4 @@
.Dd February 17, 2015
.Dd March 9, 2015
.Dt CHOWN 1
.Os sbase
.Sh NAME
@ -15,26 +15,35 @@
.Op Ar file ...
.Sh DESCRIPTION
.Nm
changes the user or group ownership for the given
.Ar files .
sets the user or group id of each
.Ar file
to the uid of
.Ar owner
or the gid of
.Ar group
respectively.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl h
Change the user ID and/or group ID of the symlink itself. This flag cannot be used
with
.Op Fl R .
Preserve
.Ar file
if it is a symbolic link.
.It Fl R
Change directory ownership recursively.
Change file ownerships recursively.
.It Fl H
Only dereference symbolic links that are passed as command line arguments when
recursively traversing directories.
Dereference
.Ar file
if it is a symbolic link.
.It Fl L
Always dereference symbolic links while recursively traversing directories.
Dereference all symbolic links.
.It Fl P
Don't dereference symbolic links (default).
Preserve symbolic links. This is the default.
.El
.Sh SEE ALSO
.Xr chown 2
.Xr chmod 1 ,
.Xr chown 2 ,
.Xr getgrnam 3 ,
.Xr getpwnam 3
.Sh STANDARDS
The
.Nm

52
chown.c
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@ -1,6 +1,7 @@
/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
@ -8,23 +9,33 @@
#include "util.h"
static int rflag = 0;
static int hflag = 0;
static int Rflag = 0;
static uid_t uid = -1;
static gid_t gid = -1;
static int ret = 0;
static char *chownf_name = "chown";
static int (*chownf)(const char *, uid_t, gid_t) = chown;
static void
chownpwgr(const char *path, int depth)
{
char *chownf_name;
int (*chownf)(const char *, uid_t, gid_t);
if (recurse_follow == 'P' || (recurse_follow == 'H' && depth) || (hflag && !depth)) {
chownf_name = "lchown";
chownf = lchown;
} else {
chownf_name = "chown";
chownf = chown;
}
if (chownf(path, uid, gid) < 0) {
weprintf("%s %s:", chownf_name, path);
ret = 1;
}
if (rflag)
} else if (Rflag) {
recurse(path, chownpwgr, depth);
}
}
static void
usage(void)
@ -35,18 +46,17 @@ usage(void)
int
main(int argc, char *argv[])
{
char *owner, *group, *end;
struct passwd *pw;
struct group *gr;
char *owner, *group;
ARGBEGIN {
case 'h':
chownf_name = "lchown";
chownf = lchown;
hflag = 1;
break;
case 'r':
case 'R':
rflag = 1;
Rflag = 1;
break;
case 'H':
case 'L':
@ -57,16 +67,10 @@ main(int argc, char *argv[])
usage();
} ARGEND;
if (argc == 0)
if (argc < 2)
usage();
if (recurse_follow == 'P') {
chownf_name = "lchown";
chownf = lchown;
}
owner = argv[0];
argv++;
argc--;
if ((group = strchr(owner, ':')))
*group++ = '\0';
@ -76,11 +80,9 @@ main(int argc, char *argv[])
if (pw) {
uid = pw->pw_uid;
} else {
if (errno != 0)
if (errno)
eprintf("getpwnam %s:", owner);
uid = strtoul(owner, &end, 10);
if (*end != '\0')
eprintf("getpwnam %s: no such user\n", owner);
uid = estrtonum(owner, 0, UINT_MAX);
}
}
if (group && *group) {
@ -89,15 +91,13 @@ main(int argc, char *argv[])
if (gr) {
gid = gr->gr_gid;
} else {
if (errno != 0)
if (errno)
eprintf("getgrnam %s:", group);
gid = strtoul(group, &end, 10);
if (*end != '\0')
eprintf("getgrnam %s: no such group\n", group);
gid = estrtonum(group, 0, UINT_MAX);
}
}
for (; argc > 0; argc--, argv++)
chownpwgr(argv[0], 0);
for (argc--, argv++; *argv; argc--, argv++)
chownpwgr(*argv, 0);
return ret;
}